<demo>
## 单例模式
</demo>
<!-- #region snippet -->
<template>
  <div class="doc-grid">
    <div class="doc-item">
      <m-tooltip content="First tooltip" placement="top">
        <m-button>First</m-button>
      </m-tooltip>
      <span>First</span>
    </div>
    <div class="doc-item">
      <m-tooltip content="Second tooltip" placement="top">
        <m-button>Second</m-button>
      </m-tooltip>
      <span>Second</span>
    </div>
    <div class="doc-item">
      <m-tooltip content="Third tooltip" placement="top">
        <m-button>Third</m-button>
      </m-tooltip>
      <span>Third</span>
    </div>
  </div>
</template>
<!-- #endregion snippet -->

